I have read all the complaints of the Arya and Sansa scenes in Season 7, and I think some viewers have interpreted it differently. I don't mean to say my interpretation was the correct one, but my reading and understanding of their interactions made actual sense.
Arya and Sansa have never gotten along since the beginning. She blamed her to what happened to Mycah (actual quote, S1E3, "You're a liar, and if you told the truth, Mycah would be alive"), just like she very much hated The Hound back then and wanted him dead. Except she had gotten to know Sandor Clegane throughout their journeys, and had grown to not hate him anymore (evidence: S5E6, when Jaqen and Arya played the Game of Faces).
The keywords here are the "Game of Faces." Arya: "I don't want to play this stupid game anymore." Jaqen: "We never stop playing." —S5E6
When they finally reunited, Arya was still cold and untrusting. But Sansa, who smiled when the guards told her about her sister, was more warm and excited. Their reunion was distant and met with brief silence and awkwardness (unlike Jon and Sansa—because Jon is more kind-hearted and forgiving, whereas Sansa finally felt safe), but despite that, Sansa was the one who came to her and hug her first. Arya didn't touch her on their first hug. But the second hug, after they talked again, was where Arya finally made peace. She finally hugged Sansa...
[To continue reading, I posted my initial thoughts on Reddit, but have forgotten my old account. Sorry.] / spoilers_the_game_of_faces_the_scenes_that...
(The following was my pinned comment from the original video):
In order to play the game of faces, there must be a "storyteller" (telling a story about oneself and making a lie sound like a truth), and/or a "listener" (trying to catch that lie). It doesn't matter if one is unaware of the situation, the other can still play and tell a dishonest story or use the skills to detect the lie. Even if the actual storyteller/listener has deep hatred to the one that was unaware.
In this video, Arya began playing the game as a storyteller by sharing her story about her childhood & her father. She then inserted a lie by saying "…killed by the Lannisters with your help." Sansa, a listener who is clearly not playing nor completely aware of the game, caught the lie by replying "What?"
Arya then angrily confronted Sansa about the letter (Arya's emotions were real here). She asked Sansa what was the letter all about and what was her actual story. In this instance, Arya is now the listener, while Sansa (who is still not playing & unaware of the game) is now the storyteller, only not fully telling but just merely answering questions from the listener.
Sansa was totally genuine about her story, her answers, and her explanation. Arya, who is definitely angry at her sister about her past decisions, was trying to catch any lie by Sansa. She couldn't. That's why in the next scene (bedroom/dagger scene), when Sansa tried to find the letter, Arya confronted her again by demonstrating the game of faces to her because she already played it/tested her without Sansa knowing—the same scenario when the Waif played it without Arya knowing ("I didn't even know I was playing").
Arya knows Sansa is truthful and now loyal to Jon and would never betray their family again because Sansa explained this herself, "I was a child." She has now changed. Arya also understands her sister's situation when Sansa said, "I've suffered things you can never imagine." That's why Arya handed the dagger to her, a sign of trust & protection, because she would, likewise, never kill nor betray Sansa and their family. My another (original) interpretation is that Arya lost the game too ("If you fool me, you win; if I catch a lie, you lose"). Sansa caught the lie: the "Lady of Winterfell" statement.
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